更新选择语句多连接

Question

我试图根据Project_CSTM表中的数据更新Contacts_CSTM表中的数据。这是我使用的查询，但我得到一个错误：

ALTER PROCEDURE Insurance_Check_Expiration 
    @ID_C AS NVARCHAR (55) = ID_C 
    AS 
BEGIN  
SET NOCOUNT ON 
IF EXISTS(SELECT * FROM CONTACTS_CSTM WHERE ID_C = @ID_c) 

Update contacts_cstm set insurance_expired_label_c = 'INSURANCE EXPIRED' 
WHERE DRIVERS_LICENSE_NUMBER_C IS NOT NULL AND @ID_C= 
(SELECT cc.id_c 
FROM PROJECT_CSTM PC 
JOIN PROJECT P 
ON P.ID = PC.ID_C 
JOIN PROJECT_RELATION PR 
ON PR.PROJECT_ID = P.ID 
JOIN CONTACTS C 
ON C.ID = PR.RELATION_ID 
JOIN CONTACTS_CSTM CC 
ON CC.ID_C = C.ID 
WHERE CC.ID_C = @ID_C AND INSURANCE_EXPIRED_C ='1') 

谢谢“从字符串转换为uniqueidentifier时转换失败”。

Answer 1

其中之一，你将@ID_C的值设置为一个值（ID_C），这显然不是有效的GUID。

这是您所做的功能等同物，运行它，您将得到相同的错误。

CREATE PROCEDURE Insurance_Check_Expiration 
    @ID_C AS NVARCHAR (55) = ID_C 
    AS 
BEGIN  
DECLARE @A UNIQUEIDENTIFIER 

SET @A = @ID_C 


END 

exec Insurance_Check_Expiration 

编辑：这是一个基于业务方案的意见的功能例如：

CREATE TABLE GUIDExample (ID_C UNIQUEIDENTIFIER) 
GO 
CREATE PROC GuidExample_Insert @ID_C UNIQUEIDENTIFIER 
AS 
BEGIN 
    SELECT @ID_C 
END 
GO 
CREATE TRIGGER GUID_Example ON GUIDExample 
AFTER INSERT 
AS 
    DECLARE @ID_C UNIQUEIDENTIFIER 

    SELECT @ID_C = ID_C 
    FROM Inserted 


    EXEC GuidExample_Insert @ID_C 
GO 

DECLARE @SampleGUID UNIQUEIDENTIFIER 

SET @SampleGUID = NEWID() 

INSERT GUIDExample (ID_C) 
VALUES(@SampleGUID)